Ncert Exercises & Solutions

Match the items in Column I with the relevant items in Column II.

Column I	Column II
A. Hydrogen peroxide is used as a	1. Sodium hexametaphosphate
B. Used in Calgon method	2. Clark's method
C. Temporary hardness of hard water is removed by	3. Reducing agent

Codes

	A	B	C
1.	3	2	1
2.	1	2	3
3.	3	1	2
4.	2	1	3

Hint: Temporary hardness of hard water is removed by Clark's method

A. Hydrogen peroxide is a perhydrol, propellant, and reducing agent.

B. Sodium hexametaphosphate is used in the Calgon method.

C. Temporary hardness of hard water is removed by Clark's method

The complex salt of metaphosphoric acid, sodium hexametaphosphate (NaPO₃)₆, is known as Calgon. It is represented as Na₂[Na₄(PO₃)₆]. Calcium and magnesium salts present in hard water react with Calgon to give complex salts.

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions